CN109473947A - A kind of low-voltage platform area neutral point drifting protective device - Google Patents
A kind of low-voltage platform area neutral point drifting protective device Download PDFInfo
- Publication number
- CN109473947A CN109473947A CN201810699606.7A CN201810699606A CN109473947A CN 109473947 A CN109473947 A CN 109473947A CN 201810699606 A CN201810699606 A CN 201810699606A CN 109473947 A CN109473947 A CN 109473947A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/207—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage also responsive to under-voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
- G01R19/16547—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies voltage or current in AC supplies
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
- H02H3/253—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage for multiphase applications, e.g. phase interruption
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of low-voltage platform area neutral point drifting protective devices.The problem of the problem of solving prior art neutrality point drift leads to overvoltage, causes various failures, and structure is complicated for existing neutral point protecting device, cannot remind operator in time.Device includes input unit, output unit, under-voltage/over-voltage protection unit, compensating unit, alarm unit, switch unit; input unit connects three phase network; input unit is connected with under-voltage/over-voltage protection unit, compensating unit, alarm unit respectively; compensating unit is grounded after passing through connection switch unit; under-voltage/over-voltage protection unit and alarm unit after connection switch unit with output unit by connecting, output unit and power distribution room connection.The present invention can the neutral point drifting unusual condition to three phase network detect, and according to unusual condition generate protection signal, control distributor disconnect work, the load of connection is protected, while can also be alarmed according to unusual condition, reminds user in time.
Description
Technical field
The present invention relates to a kind of voltage protection technical fields, protect and fill more particularly, to a kind of low-voltage platform area neutral point drifting
It sets.
Background technique
After three-phase and four-line power supply system zero curve disconnects, due to the imbalance of threephase load, lead to neutral point drifting.Zero curve is disconnected
Afterwards, former 220V electrical appliance only constitutes circuit by other phase lines without zero curve, and any two-phase phase voltage is 380V, thus tight
Weight overvoltage causes various failures.Current existing neutral point drifting protective device circuit structure is more complicated, and cannot be timely
It is alarmed to remind operator.
Summary of the invention
The present invention, which mainly solves neutral point drifting in the prior art, leads to overvoltage, causes various failures and existing
The problem of the problem of structure is complicated for neutral point protecting device, cannot remind operator in time, provides in a kind of low-voltage platform area
Property point drift protective device.
Above-mentioned technical problem of the invention is mainly to be addressed by following technical proposals: a kind of low-voltage platform area is neutral
Point drift protective device, it is characterised in that: including input unit, output unit, the under-voltage/over-voltage protection protected to deficient over-voltage
Unit owes the alarm unit that over-voltage is alarmed according to the compensating unit of deficient over-voltage generation distributor protection signal, basis, and
Control the switch unit of compensating unit, alarm unit work, the input unit connects three phase network, input unit respectively with owe
Overvoltage protecting unit, compensating unit, alarm unit are connected, and compensating unit is grounded after passing through connection switch unit, under-voltage/over-voltage protection
Unit and alarm unit after connection switch unit with output unit by connecting, output unit and power distribution room connection.This hair
It is bright can the neutral point drifting unusual condition to three phase network detect, and according to unusual condition generate protection signal, control
Distributor disconnects work, is protected to the load of connection, while can also be alarmed according to unusual condition, reminds use in time
Family.Wherein under-voltage/over-voltage protection unit is for detecting three-phase electricity voltage condition, when certain one-phase circuit occurs owing overpressure situation
When, it is protected by disconnecting circuit.Compensating unit generates protection signal when overpressure conditions occurs owing in any phase of three-phase electricity,
Signal is protected to reach distributor by output end, distributor protects the load of connection according to protection signal disconnecting circuit.
Alarm unit occurs owing alarming under overpressure situation in circuit, and sends warning message to user.Switch unit was according to owing
It presses the state of protection location to be opened and closed, controls compensating unit and alarm unit work.
As a preferred embodiment, the input unit includes three input terminals being electrically connected respectively with three-phase, Yi Jilian
The three-phase breaker QF2 on three input ports is met, the output unit includes zero line output end and connection zero line output end
Single-phase circuit breaker QF1, the under-voltage/over-voltage protection unit includes that under-voltage/over-voltage protection device U1, under-voltage/over-voltage protection device U2 and deficient over-voltage are protected
Device U3 is protected, each under-voltage/over-voltage protection device input terminal is connected respectively three output ends of three-phase breaker QF2, and the switch is single
Member includes contactor KM1, contactor KM2 and contactor KM3, and contactor KM1, contactor KM2, contactor KM3 respectively include line
Enclose KM11, coil KM21, coil KM31, under-voltage/over-voltage protection device U1, under-voltage/over-voltage protection device U2, under-voltage/over-voltage protection device U3 output end point
It Lian Jie not be connected on the single-phase circuit breaker QF1 of output unit after coil KM11, coil KM21, coil KM31.Output unit
Zero line output end is connect by cable with power distribution room branched line.Three input terminals of input unit are electrically connected with three-phase respectively.
Under-voltage/over-voltage protection device disconnects protecting circuit when circuit sends and owes over-voltage.The coil of contactor respectively with corresponding overvoltage protection
Device is cascaded, and when overvoltage protector disconnects, contactor power loss stops working, and benefit is controlled by the change of contacts status
Repay the work of unit and alarm unit.
As a preferred embodiment, the compensating unit includes single-phase circuit breaker QF3, single-phase circuit breaker QF4, single-phase open circuit
Device QF5, resistance R1, resistance R2, resistance R3, the contactor KM1, contactor KM2, contactor KM3 respectively include normally-closed contact
KM12, normally-closed contact KM22, normally-closed contact KM32 are connected to after normally-closed contact KM12, single-phase circuit breaker QF3, resistance R1 series connection
Between under-voltage/over-voltage protection device U1 input terminal and ground wire, it is connected to after normally-closed contact KM22, single-phase circuit breaker QF4, resistance R2 series connection
Between under-voltage/over-voltage protection device U2 input terminal and ground wire, it is connected to after normally-closed contact KM32, single-phase circuit breaker QF5, resistance R3 series connection
Between under-voltage/over-voltage protection device U3 input terminal and ground wire.Compensating unit gives power distribution room end according to generation signal the case where under-voltage.When
When under-voltage situation occurs for a certain phase line, the protection location of the corresponding route cuts off circuit, the corresponding normally closed touching of switch unit
Point closes the switch, so that circuit is connected all the way in compensating unit, electric current is by breaker and is electronically connected to 1.5- on the earth field
2.5A leakage current, the current feedback to power distribution room force power distribution room residual current operated protective device to trip, play a protective role.
As a preferred embodiment, the alarm unit includes handset warner and loudspeaker, and the handset warner is just
The connection of one output end of pole input terminal and input unit, the negative input of handset warner connects output unit, described to connect
Tentaculum KM1, contactor KM2, contactor KM3 respectively include normally opened contact KM13, normally opened contact KM23, normally opened contact KM33, often
The cathode output end and cathode of handset warner are connected to after opening contact KM13, normally opened contact KM23 and normally opened contact KM33 series connection
Between output end, the signal output end of handset warner connects loudspeaker.Handset warner and the normally opened touching of each contactor in this programme
Point constitutes a circuit, and in normal state, each reception centre device normally opened contact closure, handset warner receives signal at this time
Without alarm, when occurring to owe over-voltage, when there is contactor to stop working, normally opened contact is in off-state, and circuit is broken
It opens, the input signal on handset warner changes at this time, and handset warner generates alarm signal, is alarmed by loudspeaker.
As a preferred embodiment, including cabinet, insulation board is provided in cabinet, the under-voltage/over-voltage protection unit is mended
It repays unit, switch unit and passes through guide rail respectively and be mounted on insulation board.
As a preferred embodiment, including cabinet, the alarm unit are mounted in cabinet or are mounted in power distribution room.Report
Alert unit is mounted on device box end or power distribution room end according to demand, plays the function of reminding in time staff.
It as a preferred embodiment, further include communication unit, the communication unit is connected with handset warner, communication unit
It is connect by network with remote user end.Handset warner passes through network by communication unit after generating alarm signal
Alarm signal is sent to remote user end, operator is reminded, so that operator at the scene also can not be timely
Solve situation.Communication unit is network access device, is connect by cable with handset warner.
Therefore, the invention has the advantages that can the neutral point drifting unusual condition to three phase network detect, and according to
Unusual condition generates protection signal, and control distributor disconnects work, protected to the load of connection, while can also be according to different
Normal situation is alarmed, and reminds user in time.
Detailed description of the invention
Attached drawing 1 is a kind of structural frames diagram of the invention；
Attached drawing 2 is a kind of electrical block diagram of the invention.
1- input unit 2- compensating unit 3- under-voltage/over-voltage protection unit 4- alarm unit 5- switch unit 6- output is single
First 7- power distribution room 8- handset warner 9- loudspeaker 10- communication unit.
Specific embodiment
Below with reference to the embodiments and with reference to the accompanying drawing the technical solutions of the present invention will be further described.
Embodiment:
A kind of low-voltage platform area neutral point drifting protective device of the present embodiment, as shown in Figure 1, include input unit 1, output unit 6,
Compensating unit 2, the root of under-voltage/over-voltage protection unit 3, the deficient over-voltage generation distributor protection signal of basis that deficient over-voltage is protected
The alarm unit 4 alarmed according to deficient over-voltage, and the switch unit 5 of control compensating unit, alarm unit work.Input unit
Three phase network is connected, input unit is connected with under-voltage/over-voltage protection unit, compensating unit, alarm unit respectively, and compensating unit passes through
Be grounded after connection switch unit, under-voltage/over-voltage protection unit and alarm unit by being connect after connection switch unit with output unit,
Output unit and power distribution room connection.
As shown in Fig. 2, input unit includes three the input terminal A being electrically connected respectively with three-phase, input terminal B, input terminal C,
And it is connected to the three-phase breaker QF2 on three input terminals.Output unit includes zero line output end N and connection zero line output end
The single-phase circuit breaker QF1 of N.
Under-voltage/over-voltage protection unit includes under-voltage/over-voltage protection device U1, under-voltage/over-voltage protection device U2 and under-voltage/over-voltage protection device U3, is owed
Pressure protector U1 input terminal is connect with the A circuitry phase output end of three-phase breaker QF2, under-voltage/over-voltage protection device U2 input terminal and three-phase
The B circuitry phase output end of circuit breaker Q F2 connects, and the C circuitry phase of under-voltage/over-voltage protection device U3 input terminal and three-phase breaker QF2 export
End connection.
Switch unit includes contactor KM1, contactor KM2 and contactor KM3, contactor KM1, contactor KM2, contactor
KM3 respectively includes coil KM11, coil KM21, coil KM31, normally-closed contact KM11, normally-closed contact KM21, normally-closed contact KM31,
And normally opened contact KM12, normally opened contact KM22, normally opened contact KM32.Wherein under-voltage/over-voltage protection device U1, under-voltage/over-voltage protection device U2,
Under-voltage/over-voltage protection device U3 output end is connected to the single-phase of output unit after being separately connected coil KM11, coil KM21, coil KM31
On circuit breaker Q F1.
Compensating unit include single-phase circuit breaker QF3, single-phase circuit breaker QF4, single-phase circuit breaker QF5, resistance R1, resistance R2,
Resistance R3.Under-voltage/over-voltage protection device U1 input terminal and ground are connected to after normally-closed contact KM12, single-phase circuit breaker QF3, resistance R1 series connection
Between line, under-voltage/over-voltage protection device U2 input terminal and ground are connected to after normally-closed contact KM22, single-phase circuit breaker QF4, resistance R2 series connection
Between line, under-voltage/over-voltage protection device U3 input terminal and ground are connected to after normally-closed contact KM32, single-phase circuit breaker QF5, resistance R3 series connection
Between line.
Alarm unit includes handset warner 8, loudspeaker 9 and communication unit 10, the electrode input end of handset warner with it is defeated
Enter the C phase output terminal connection of the three-phase breaker QF2 of unit, the negative input of handset warner connects the single-phase of output unit
Circuit breaker Q F1 input terminal.Handset warner is connected to after normally opened contact KM13, normally opened contact KM23 and normally opened contact KM33 series connection
Cathode output end and cathode output end between, the signal output end of handset warner connection loudspeaker and communication unit, communication is single
Member is connect by network with remote user end, which is mobile phone or computer.
Device includes cabinet, and insulation board, under-voltage/over-voltage protection unit, compensating unit, switch unit difference are provided in cabinet
It is mounted on insulation board by guide rail.Alarm unit is mounted in cabinet or is mounted in power distribution room.
At work, under normal circumstances, A phase, B phase, C phase voltage works normally, under-voltage/over-voltage protection device U1, U2, U3 conducting,
Then coil KM11, KM21, KM31 be powered, normally-closed contact KM12, normally-closed contact KM22, normally-closed contact KM32 open, electric current without
Resistance R1, resistance R2, resistance R3 ground connection are crossed, normally opened contact KM13, normally opened contact KM23, normally opened contact KM33 are not acted,
Handset warner does not generate alarm signal.
If occurring to owe overpressure situation, the present embodiment is by taking A phase voltage occurs to owe over-voltage as an example, when A phase voltage is lower than
170V or be higher than 270V when, corresponding under-voltage/over-voltage protection device U1 cuts off the power, then KM11 power loss early period of contactor KM1,
Normally closed opposite bank KM12 saves closure, and A phase current is connected to ground after flowing through normally-closed contact KM11, single-phase circuit breaker QF3, resistance R1,
1.5-2.5A leakage current is generated, power distribution room is transmitted to by output end, so that power distribution room residual current operated protective device trips, thus disconnected
Switch power supply plays neutral point drifting protection.Normally opened contact KM13 is remained open simultaneously, handset warner circuit is disconnected, so that defeated
The signal for entering handset warner changes, and handset warner generates warning message, and loudspeaker receive alarm signal and alarm,
Alarm signal is occurred by network to remote user end communication unit.Any one phase of A phase, B phase, C phase or colleague occur low
In 170V or be higher than 270V the case where, working principle is all identical.
Specific embodiment described herein is only an example for the spirit of the invention.The neck of technology belonging to the present invention
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Although it is single that input unit, compensating unit, under-voltage/over-voltage protection unit, alarm unit, switch is used more herein
The terms such as member, but it does not exclude the possibility of using other terms.The use of these items is only for more easily describing and
Explain essence of the invention；Being construed as any additional limitation is disagreed with spirit of that invention.
Claims (7)
1. a kind of low-voltage platform area neutral point drifting protective device, it is characterised in that: including input unit, output unit, to owing
The under-voltage/over-voltage protection unit protected, basis is pressed to owe the compensating unit of over-voltage generation distributor protection signal, according to deficient over-voltage
The alarm unit alarmed, and the switch unit of control compensating unit, alarm unit work, the input unit connection three
Phase power grid, input unit are connected with under-voltage/over-voltage protection unit, compensating unit, alarm unit respectively, and compensating unit is opened by connection
It is grounded after closing unit, by connecting after connection switch unit with output unit, output is single for under-voltage/over-voltage protection unit and alarm unit
Member and power distribution room connection.
2. a kind of low-voltage platform area neutral point drifting protective device according to claim 1, it is characterized in that the input unit
The input terminal being electrically connected respectively with three-phase including three, and the three-phase breaker QF2 being connected on three input ports, it is described
Output unit includes the single-phase circuit breaker QF1 at zero line output end and connection zero line output end, and the under-voltage/over-voltage protection unit includes
Under-voltage/over-voltage protection device U1, under-voltage/over-voltage protection device U2 and under-voltage/over-voltage protection device U3, each under-voltage/over-voltage protection device input terminal respectively correspond
Three output ends of three-phase breaker QF2 are connected, the switch unit includes contactor KM1, contactor KM2 and contactor KM3,
Contactor KM1, contactor KM2, contactor KM3 respectively include coil KM11, coil KM21, coil KM31, under-voltage/over-voltage protection device
U1, under-voltage/over-voltage protection device U2, under-voltage/over-voltage protection device U3 output end connect after being separately connected coil KM11, coil KM21, coil KM31
It is connected on the single-phase circuit breaker QF1 of output unit.
3. a kind of low-voltage platform area neutral point drifting protective device according to claim 2, it is characterized in that the compensating unit
Including single-phase circuit breaker QF3, single-phase circuit breaker QF4, single-phase circuit breaker QF5, resistance R1, resistance R2, resistance R3, the contactor
KM1, contactor KM2, contactor KM3 respectively include normally-closed contact KM12, normally-closed contact KM22, normally-closed contact KM32, normally closed touching
It is connected between under-voltage/over-voltage protection device U1 input terminal and ground wire after point KM12, single-phase circuit breaker QF3, resistance R1 series connection, normally closed touching
It is connected between under-voltage/over-voltage protection device U2 input terminal and ground wire after point KM22, single-phase circuit breaker QF4, resistance R2 series connection, normally closed touching
It is connected between under-voltage/over-voltage protection device U3 input terminal and ground wire after point KM32, single-phase circuit breaker QF5, resistance R3 series connection.
4. a kind of low-voltage platform area neutral point drifting protective device according to claim 2, it is characterized in that the alarm unit
Including handset warner and loudspeaker, the electrode input end of the handset warner and an output end of input unit are connected, hand
The negative input of machine alarm connects output unit, and the contactor KM1, contactor KM2, contactor KM3 are respectively included often
Open contact KM13, normally opened contact KM23, normally opened contact KM33, normally opened contact KM13, normally opened contact KM23 and normally opened contact KM33
It is connected between the cathode output end of handset warner and cathode output end after series connection, the signal output end connection of handset warner
Loudspeaker.
5. a kind of low-voltage platform area neutral point drifting protective device according to claim 1 or 2 or 3, it is characterized in that including case
Body, is provided with insulation board in cabinet, and the under-voltage/over-voltage protection unit, compensating unit, switch unit are installed by guide rail respectively
On insulation board.
6. a kind of low-voltage platform area neutral point drifting protective device according to claim 1 or 2 or 4, it is characterized in that including case
Body, the alarm unit are mounted in cabinet or are mounted in power distribution room.
7. a kind of low-voltage platform area neutral point drifting protective device according to claim 5, it is characterized in that further including that communication is single
Member, the communication unit are connected with handset warner, and communication unit is connect by network with remote user end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810699606.7A CN109473947A (en) | 2018-06-29 | 2018-06-29 | A kind of low-voltage platform area neutral point drifting protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810699606.7A CN109473947A (en) | 2018-06-29 | 2018-06-29 | A kind of low-voltage platform area neutral point drifting protective device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109473947A true CN109473947A (en) | 2019-03-15 |
Family
ID=65660078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810699606.7A Pending CN109473947A (en) | 2018-06-29 | 2018-06-29 | A kind of low-voltage platform area neutral point drifting protective device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109473947A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2230060Y (en) * | 1995-06-22 | 1996-06-26 | 吴震宇 | Protective arrangement for neutral wire for disconnection |
| CN2279724Y (en) * | 1996-07-19 | 1998-04-22 | 陈满平 | Leakage breaker with zero line detection function |
| JP2001136653A (en) * | 1999-11-05 | 2001-05-18 | Kawamura Electric Inc | Neutral line open-phase protective breaker for single- phase three-wire system |
| CN201733065U (en) * | 2010-06-30 | 2011-02-02 | 中芯国际集成电路制造(上海)有限公司 | Low-voltage single-phase power source overvoltage protective device |
| CN201985508U (en) * | 2011-04-22 | 2011-09-21 | 黄灿育 | Zero line break protector and connecting structure thereof |
| CN203377582U (en) * | 2013-07-13 | 2014-01-01 | 邬立新 | Overvoltage breaking zero protection device |
| CN104134967A (en) * | 2014-08-19 | 2014-11-05 | 国网浙江宁波市鄞州区供电公司 | Neutral line breaking protection device |
| CN208571574U (en) * | 2018-06-29 | 2019-03-01 | 国家电网有限公司 | Low-voltage platform area neutral point drifting protective device |
-
2018
- 2018-06-29 CN CN201810699606.7A patent/CN109473947A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2230060Y (en) * | 1995-06-22 | 1996-06-26 | 吴震宇 | Protective arrangement for neutral wire for disconnection |
| CN2279724Y (en) * | 1996-07-19 | 1998-04-22 | 陈满平 | Leakage breaker with zero line detection function |
| JP2001136653A (en) * | 1999-11-05 | 2001-05-18 | Kawamura Electric Inc | Neutral line open-phase protective breaker for single- phase three-wire system |
| CN201733065U (en) * | 2010-06-30 | 2011-02-02 | 中芯国际集成电路制造(上海)有限公司 | Low-voltage single-phase power source overvoltage protective device |
| CN201985508U (en) * | 2011-04-22 | 2011-09-21 | 黄灿育 | Zero line break protector and connecting structure thereof |
| CN203377582U (en) * | 2013-07-13 | 2014-01-01 | 邬立新 | Overvoltage breaking zero protection device |
| CN104134967A (en) * | 2014-08-19 | 2014-11-05 | 国网浙江宁波市鄞州区供电公司 | Neutral line breaking protection device |
| CN208571574U (en) * | 2018-06-29 | 2019-03-01 | 国家电网有限公司 | Low-voltage platform area neutral point drifting protective device |
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Application publication date: 20190315 |
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